>One problem in addition to the A record issue was when no A records or
>MX records existed for a domain but the domain still had DNS records.
IMGate handles this situation by checking every message's envelope
@sender.domain and @recipient.domain for A and/or MX records. If neither
exists in DNS, then IMGate rejects the message, either with a 5xx if DNS
answers negatively ("nxdomain"), or with 4xx if DNS times out (no answer).
IMgate doesn't have a sense of incoming or outgoing, so it will reject
outgoing mail from Imail to Internet with the above DNS validation
failure. I guess if Imail got a 4xx from IMGate, IMail would defer the msg
and try later until queue lifetime expires.
Len
__________________________________________________________________
www.menandmice.com/DNS-training : DNS Training
BIND8NT.MEIway.com : ISC BIND for NT4 & W2K
IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
Please visit http://www.ipswitch.com/support/mailing-lists.html
to be removed from this list.
An Archive of this list is available at:
http://www.mail-archive.com/imail_forum%40list.ipswitch.com/
Please visit the Knowledge Base for answers to frequently asked
questions: http://www.ipswitch.com/support/IMail/
